package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;


    /**
     * 根据时间区间统计营业额
     * @param begin
     * @param end
     * @return
     */
    public TurnoverReportVO getTurnover(LocalDate begin, LocalDate end) {
        //当前集合用于存放从begin到end的每天的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);

        while (!begin.equals(end)){
            begin = begin.plusDays(1);//日期计算，获得指定日期后1天的日期
            dateList.add(begin);
        }


        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap();
            map.put("status", Orders.COMPLETED);
            map.put("begin",beginTime);
            map.put("end", endTime);
            Double turnover = orderMapper.sumByMap(map);
            turnover = (turnover == null ? 0.0 : turnover); // 如果turnover为null，则赋值为0.0
            turnoverList.add(turnover);
        }

        //数据封装，封装返回结果。
        return TurnoverReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .turnoverList(StringUtils.join(turnoverList,","))
                .build();
    }
    /*
    * 统计指定时间区间内的用户数据*/
    public UserReportVO getUserStatistics(LocalDate beginTime, LocalDate endTime) {
        //存放begin到end之间每一天的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(beginTime);
        while (!beginTime.equals(endTime)){
            beginTime = beginTime.plusDays(1);
            dateList.add(beginTime);
        }
        // 存放每天的新增用户数量
        List<Integer> newUserList = new ArrayList<>();
        // 存放每天的总用户数量
        List<Integer> totalUserList = new ArrayList<>();
        for(LocalDate date : dateList){
            LocalDateTime begin = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime end = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap();
            map.put("end",end);
            // 总用户数量
            Integer totalUser = userMapper.countByMap(map);
            map.put("begin",begin);
            // 新增用户数量
            Integer newUser = userMapper.countByMap(map);
            totalUserList.add(totalUser);
            newUserList.add(newUser);
        }
      return UserReportVO
              .builder().dateList(StringUtils.join(dateList,","))
              .totalUserList(StringUtils.join(totalUserList,","))
              .newUserList(StringUtils.join(newUserList,","))
              .build();
    }
    /**
     * 根据时间区间统计订单数量
     * @param begin
     * @param end
     * @return
     */
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end){
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);

        while (!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        //每天订单总数集合
        List<Integer> orderCountList = new ArrayList<>();
        //每天有效订单数集合
        List<Integer> validOrderCountList = new ArrayList<>();
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            //查询每天的总订单数 select count(id) from orders where order_time > ? and order_time < ?
            Integer orderCount = getOrderCount(beginTime, endTime, null);

            //查询每天的有效订单数 select count(id) from orders where order_time > ? and order_time < ? and status = ?
            Integer validOrderCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);

            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }

        //时间区间内的总订单数
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
        //时间区间内的总有效订单数
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();
        //订单完成率
        Double orderCompletionRate = 0.0;
        if(totalOrderCount != 0){
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }
        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }
    /**
     * 根据时间区间统计指定状态的订单数量
     * @param beginTime
     * @param endTime
     * @param status
     * @return
     */
    private Integer getOrderCount(LocalDateTime beginTime, LocalDateTime endTime, Integer status) {
        Map map = new HashMap();
        map.put("status", status);
        map.put("begin",beginTime);
        map.put("end", endTime);
        return orderMapper.countByMap(map);
    }
    /*
    * 统计指定时间区间内的销量排名前10*/


    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
     LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
     LocalDateTime endTime= LocalDateTime.of(end, LocalTime.MAX);
     List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);
     List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
     String nameList = StringUtils.join(names, ",");
     List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
     String numberList = StringUtils.join(numbers, ",");
     return SalesTop10ReportVO
             .builder()
             .nameList(nameList)
             .numberList(numberList)
             .build();
    }
    /*
    * 导出运营数据报表*/
    public void exportBusinessData(HttpServletResponse response) {
        //1. 查询数据库，获取营业数据-- 查询最近30天的运营数据
        LocalDate begin = LocalDate.now().minusDays(30);
        LocalDate end = LocalDate.now().minusDays(1);
        // 查询概览数据
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(LocalDateTime.of(begin, LocalTime.MIN), LocalDateTime.of(end, LocalTime.MAX));
        //2 .通过POI 将数据写入到excel中
        InputStream in =  this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");
        // 基于模板文件，创建一个excel表格对象
        try {
            XSSFWorkbook excel = new XSSFWorkbook(in);
            // 获取表格文件的sheet页码
            XSSFSheet sheet = excel.getSheet("Sheet1");
            // 填充数据-时间
            excel.getSheet("Sheet1").getRow(1).getCell(1).setCellValue(begin + "至" + end);
            // 获得第四行
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());  // 订单完成率
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());
            // 获得第五行
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());
//          row.getCell(6).setCellValue(businessDataVO.getAllOrders());
            // 填充明细数据
            for(int i=0 ;i< 30;i++){
                LocalDate date = begin.plusDays(i);
                // 查询日期对应的数据
                BusinessDataVO businessDataOfDate = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));
                // 获取日期对应的行
                XSSFRow row1 = sheet.getRow(7 + i);
                // 设置值
                row1.getCell(1).setCellValue(date.toString());
                row1.getCell(2).setCellValue(businessDataOfDate.getTurnover());
                row1.getCell(3).setCellValue(businessDataOfDate.getValidOrderCount());
                row1.getCell(4).setCellValue(businessDataOfDate.getOrderCompletionRate());
                row1.getCell(5).setCellValue(businessDataOfDate.getUnitPrice());
                row1.getCell(6).setCellValue(businessDataOfDate.getNewUsers());
            }
            //3. 通过输出流将excel将文件下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);
            // 关闭资源
            out.close();
            excel.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}